Christian faith is a reality that represents in its complexity a central object of theological research. It determines a primary hermeneutic horizon of the theological thinking. It is an object and horizon that has its specific structure and inner dynamics, and these are in the focus of the fundamental theology. Assuming the existence of diverse models of the fundamental theology, the author analyses some of the best known and most valuable fundamental-theological approaches to the study of the faith. Concurrently, he desires to highlight the fact, that despite their differences, the single approaches contain some common points. These are given by the topic related to the Christian faith and its rational ‘intelligibility’, by the question of interpretation of the faith in the anthropological key, by the necessity to study the complexity the faith in the light of Christology. The author does not forget to point out the fact that the fundamental theology is challenged today to grasp these characteristic points in a way that would permit to enter the creative evangelising confrontation with the postmodern (and post-Christian) world and to the constructive dialogue with other religions.